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| <div class="subTitle">org.apache.beam.sdk.io.aws2.kinesis</div> |
| <h2 title="Class KinesisIO" class="title">Class KinesisIO</h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.io.aws2.kinesis.KinesisIO</li> |
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| <pre><a href="../../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#SOURCE_SINK">SOURCE_SINK</a>) |
| public final class <span class="typeNameLabel">KinesisIO</span> |
| extends java.lang.Object</pre> |
| <div class="block">IO to read from <a href="https://aws.amazon.com/kinesis/">Kinesis</a> streams. |
| |
| <h3>Reading from Kinesis</h3> |
| |
| <p>Example usages: |
| |
| <pre><code> |
| p.apply(KinesisIO.read() |
| .withStreamName("streamName") |
| .withInitialPositionInStream(InitialPositionInStream.LATEST) |
| .apply( ... ) // other transformations |
| </code></pre> |
| |
| <p>At a minimum you have to provide: |
| |
| <ul> |
| <li>the name of the stream to read |
| <li>the position in the stream where to start reading, e.g. <code>InitialPositionInStream.LATEST</code>, <code>InitialPositionInStream.TRIM_HORIZON</code>, or |
| alternatively, using an arbitrary point in time with <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html#withInitialTimestampInStream-org.joda.time.Instant-"><code>KinesisIO.Read.withInitialTimestampInStream(Instant)</code></a>. |
| </ul> |
| |
| <h4>Watermarks</h4> |
| |
| <p>Kinesis IO uses arrival time for watermarks by default. To use processing time instead, use |
| <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html#withProcessingTimeWatermarkPolicy--"><code>KinesisIO.Read.withProcessingTimeWatermarkPolicy()</code></a>: |
| |
| <pre><code> |
| p.apply(KinesisIO.read() |
| .withStreamName("streamName") |
| .withInitialPositionInStream(InitialPositionInStream.LATEST) |
| .withProcessingTimeWatermarkPolicy()) |
| </code></pre> |
| |
| <p>It is also possible to specify a custom watermark policy to control watermark computation |
| using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html#withCustomWatermarkPolicy-org.apache.beam.sdk.io.aws2.kinesis.WatermarkPolicyFactory-"><code>KinesisIO.Read.withCustomWatermarkPolicy(WatermarkPolicyFactory)</code></a>. This requires implementing |
| <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/WatermarkPolicy.html" title="interface in org.apache.beam.sdk.io.aws2.kinesis"><code>WatermarkPolicy</code></a> with a corresponding <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/WatermarkPolicyFactory.html" title="interface in org.apache.beam.sdk.io.aws2.kinesis"><code>WatermarkPolicyFactory</code></a>. |
| |
| <h4>Throttling</h4> |
| |
| <p>By default Kinesis IO will poll the Kinesis <code>getRecords()</code> API as fast as possible as |
| long as records are returned. The <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/RateLimitPolicyFactory.DefaultRateLimiter.html" title="class in org.apache.beam.sdk.io.aws2.kinesis"><code>RateLimitPolicyFactory.DefaultRateLimiter</code></a> will start |
| throttling once <code>getRecords()</code> returns an empty response or if API calls get throttled by |
| AWS. |
| |
| <p>A <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/RateLimitPolicy.html" title="interface in org.apache.beam.sdk.io.aws2.kinesis"><code>RateLimitPolicy</code></a> is always applied to each shard individually. |
| |
| <p>You may provide a custom rate limit policy using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html#withCustomRateLimitPolicy-org.apache.beam.sdk.io.aws2.kinesis.RateLimitPolicyFactory-"><code>KinesisIO.Read.withCustomRateLimitPolicy(RateLimitPolicyFactory)</code></a>. This requires implementing <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/RateLimitPolicy.html" title="interface in org.apache.beam.sdk.io.aws2.kinesis"><code>RateLimitPolicy</code></a> with a corresponding <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/RateLimitPolicyFactory.html" title="interface in org.apache.beam.sdk.io.aws2.kinesis"><code>RateLimitPolicyFactory</code></a>. |
| |
| <h3>Writing to Kinesis</h3> |
| |
| <p>Example usages: |
| |
| <pre><code> PCollection<KV<String, byte[]>> data = ...; |
| |
| data.apply(KinesisIO.write() |
| .withStreamName("streamName") |
| .withPartitionKey(KV::getKey) |
| .withSerializer(KV::getValue); |
| </code></pre> |
| |
| <p>Note: Usage of <a href="../../../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values"><code>KV</code></a> is just for illustration purposes here. |
| |
| <p>At a minimum you have to provide: |
| |
| <ul> |
| <li>the name of the Kinesis stream to write to, |
| <li>a <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisPartitioner.html" title="interface in org.apache.beam.sdk.io.aws2.kinesis"><code>KinesisPartitioner</code></a> to distribute records across shards of the stream |
| <li>and a function to serialize your data to bytes on the stream |
| </ul> |
| |
| Though, generally, it's recommended to configure client retries using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/common/ClientConfiguration.html" title="class in org.apache.beam.sdk.io.aws2.common"><code>ClientConfiguration</code></a>, see below. |
| |
| <h4>Partitioning of writes</h4> |
| |
| Choosing the right partitioning strategy by means of a <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisPartitioner.html" title="interface in org.apache.beam.sdk.io.aws2.kinesis"><code>KinesisPartitioner</code></a> is one of the |
| key considerations when writing to Kinesis. Typically, you should aime to evenly distribute data |
| across all shards of the stream. |
| |
| <p>Partition keys are used as input to a hash function that maps the partition key and associated |
| data to a specific shard. If the cardinality of your partition keys is of the same order of |
| magnitude as the number of shards in the stream, the hash function will likely not distribute |
| your keys evenly among shards. This may result in heavily skewed shards with some shards not |
| utilized at all. |
| |
| <p>If you require finer control over the distribution of records, override <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisPartitioner.html#getExplicitHashKey-T-"><code>KinesisPartitioner.getExplicitHashKey(Object)</code></a> according to your needs. However, this might |
| impact record aggregation. |
| |
| <h4>Aggregation of records</h4> |
| |
| To better leverage Kinesis API limits and to improve producer throughput, the writer aggregates |
| multiple users records into an <a |
| href="https://docs.aws.amazon.com/streams/latest/dev/kinesis-kpl-concepts.html#kinesis-kpl-concepts-aggretation">aggregated |
| KPL record</a>. |
| |
| <p>Records of the same effective hash key get aggregated. The effective hash key is: |
| |
| <ol> |
| <li>the explicit hash key, if provided. |
| <li>the lower bound of the hash key range of the target shard according to the given partition |
| key, if available. |
| <li>or otherwise the hashed partition key |
| </ol> |
| |
| <p>To provide shard aware aggregation in 2., hash key ranges of shards are loaded and refreshed |
| periodically. This allows to aggregate records into a number of aggregates that matches the |
| number of shards in the stream to max out Kinesis API limits the best possible way. |
| |
| <p><b>Note:</b>There's an important downside to consider when using shard aware aggregation: |
| records get assigned to a shard (via an explicit hash key) on the client side, but respective |
| client side state can't be guaranteed to always be up-to-date. If a shard gets split, all |
| aggregates are mapped to the lower child shard until state is refreshed. Timing, however, will |
| diverge between the different workers. |
| |
| <p>If using an <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisPartitioner.ExplicitPartitioner.html" title="interface in org.apache.beam.sdk.io.aws2.kinesis"><code>KinesisPartitioner.ExplicitPartitioner</code></a> or disabling shard refresh via <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.RecordAggregation.html" title="class in org.apache.beam.sdk.io.aws2.kinesis"><code>KinesisIO.RecordAggregation</code></a>, no shard details will be loaded (and used). |
| |
| <p>Record aggregation can be entirely disabled using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Write.html#withRecordAggregationDisabled--"><code>KinesisIO.Write.withRecordAggregationDisabled()</code></a>. |
| |
| <h3>Configuration of AWS clients</h3> |
| |
| <p>AWS clients for all AWS IOs can be configured using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/options/AwsOptions.html" title="interface in org.apache.beam.sdk.io.aws2.options"><code>AwsOptions</code></a>, e.g. <code>--awsRegion=us-west-1</code>. <a href="../../../../../../../org/apache/beam/sdk/io/aws2/options/AwsOptions.html" title="interface in org.apache.beam.sdk.io.aws2.options"><code>AwsOptions</code></a> contain reasonable defaults based on default providers |
| for <a href="https://static.javadoc.io/software.amazon.awssdk/regions/2.17.127/software/amazon/awssdk/regions/Region.html?is-external=true" title="class or interface in software.amazon.awssdk.regions"><code>Region</code></a> and <a href="https://static.javadoc.io/software.amazon.awssdk/auth/2.17.127/software/amazon/awssdk/auth/credentials/AwsCredentialsProvider.html?is-external=true" title="class or interface in software.amazon.awssdk.auth.credentials"><code>AwsCredentialsProvider</code></a>. |
| |
| <p>If you require more advanced configuration, you may change the <a href="../../../../../../../org/apache/beam/sdk/io/aws2/common/ClientBuilderFactory.html" title="interface in org.apache.beam.sdk.io.aws2.common"><code>ClientBuilderFactory</code></a> |
| using <a href="../../../../../../../org/apache/beam/sdk/io/aws2/options/AwsOptions.html#setClientBuilderFactory-java.lang.Class-"><code>AwsOptions.setClientBuilderFactory(Class)</code></a>. |
| |
| <p>Configuration for a specific IO can be overwritten using <code>withClientConfiguration()</code>, |
| which also allows to configure the retry behavior for the respective IO. |
| |
| <h4>Retries</h4> |
| |
| <p>Retries for failed requests can be configured using <code>ClientConfiguration.Builder#retry(Consumer)</code> and are handled by the AWS SDK unless there's a |
| partial success (batch requests). The SDK uses a backoff strategy with equal jitter for computing |
| the delay before the next retry. |
| |
| <p><b>Note:</b> Once retries are exhausted the error is surfaced to the runner which <em>may</em> |
| then opt to retry the current partition in entirety or abort if the max number of retries of the |
| runner is reached.</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html" title="class in org.apache.beam.sdk.io.aws2.kinesis">KinesisIO.Read</a></span></code> |
| <div class="block">Implementation of <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.html#read--"><code>read()</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.RecordAggregation.html" title="class in org.apache.beam.sdk.io.aws2.kinesis">KinesisIO.RecordAggregation</a></span></code> |
| <div class="block">Configuration of Kinesis record aggregation.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Write.html" title="class in org.apache.beam.sdk.io.aws2.kinesis">KinesisIO.Write</a><<a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Write.html" title="type parameter in KinesisIO.Write">T</a>></span></code> |
| <div class="block">Implementation of <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.html#write--"><code>write()</code></a>.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.html#KinesisIO--">KinesisIO</a></span>()</code> </td> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html" title="class in org.apache.beam.sdk.io.aws2.kinesis">KinesisIO.Read</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.html#read--">read</a></span>()</code> |
| <div class="block">Returns a new <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html" title="class in org.apache.beam.sdk.io.aws2.kinesis"><code>KinesisIO.Read</code></a> transform for reading from Kinesis.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Write.html" title="class in org.apache.beam.sdk.io.aws2.kinesis">KinesisIO.Write</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.html#write--">write</a></span>()</code> |
| <div class="block">Returns a new <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Write.html" title="class in org.apache.beam.sdk.io.aws2.kinesis"><code>KinesisIO.Write</code></a> transform for writing to Kinesis.</div> |
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| <h3>Methods inherited from class java.lang.Object</h3> |
| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
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| <h4>KinesisIO</h4> |
| <pre>public KinesisIO()</pre> |
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| <h4>read</h4> |
| <pre>public static <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html" title="class in org.apache.beam.sdk.io.aws2.kinesis">KinesisIO.Read</a> read()</pre> |
| <div class="block">Returns a new <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Read.html" title="class in org.apache.beam.sdk.io.aws2.kinesis"><code>KinesisIO.Read</code></a> transform for reading from Kinesis.</div> |
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| <h4>write</h4> |
| <pre>public static <T> <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Write.html" title="class in org.apache.beam.sdk.io.aws2.kinesis">KinesisIO.Write</a><T> write()</pre> |
| <div class="block">Returns a new <a href="../../../../../../../org/apache/beam/sdk/io/aws2/kinesis/KinesisIO.Write.html" title="class in org.apache.beam.sdk.io.aws2.kinesis"><code>KinesisIO.Write</code></a> transform for writing to Kinesis.</div> |
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